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Give explanation about Stored Program Control.
Stored Program Control: In this centralized control, all the control equipment is replaced through a single processor that must be quite powerful. This must be able of processing 10 to 100 calls per second, depending upon the load on the system, and concurrently performing several other ancillary tasks. A classical control configuration of an ESS by using centralized SPC is demonstrated in figure. A centralized SPC configuration may utilize more than one processor for redundancy reasons.
In about all the present day electronic switching systems utilizing centralized control, only a two-processor configuration is utilized. Dual processor architecture may be configured to function in one of three modes:
1. Standby mode
2. Synchronous duplex mode
3. Load Sharing mode
FIG - Typically Centralized SPC Organization
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